CN101811882A

CN101811882A - Composite bauxite-silicon nitride wear-resistant brick for large cement kiln and production method thereof

Info

Publication number: CN101811882A
Application number: CN 201010161682
Authority: CN
Inventors: 夏文斌; 李勇; 王林俊; 李燕京; 高长贺; 周伟
Original assignee: BEIJING TONGDA REFRACTORY TECHNOLOGIES Co Ltd; University of Science and Technology Beijing USTB
Current assignee: BEIJING TONGDA REFRACTORY TECHNOLOGIES Co Ltd; University of Science and Technology Beijing USTB
Priority date: 2010-04-27
Filing date: 2010-04-27
Publication date: 2010-08-25

Abstract

The invention relates to a composite bauxite-silicon nitride wear-resistant brick for a large cement kiln and a production method thereof, which belongs to the field of refractory materials. The invention is characterized in that superfine bauxite clinker, carborundum and silicon nitride are adopted as raw materials which are mixed in the mass percent of 65-80 of superfine bauxite clinker equal to or less than 5 mm (Al2O3 equal to or more than 85%), 5-15 of carborundum equal to or less than 1.5 mm (SiC equal to or more than 90%), 1-15 of silicon nitride equal to or less than 0.088 mm (Si3N4 equal to or more than 98%) and 4-8 of bonding clay equal to or less than 0.088 mm; 0.2-0.7 % of industrial dextrin or lignine and 2-5% of water are added into the materials after mixing for mulling, pressing and drying; and then composite bauxite-silicon nitride wear-resistant bricks are produced by baking the mixed materials at the temperature of 1300-1450 DEG C. The brick is applicable to cement kilns in various specifications, and has obvious heat insulation effect, high wear resistance and long service life up to 1.5 years. The invention takes a very positive role on the operation rate of large rotary cement kilns, and the obtained composite bauxite-silicon nitride wear-resistant brick is simple in process and low in cost.

Description

A kind of large-size cement kiln alumina-silicon nitride compound abrasive brick and manufacture method thereof

Technical field:

The invention belongs to fire resisting material field, relate to a kind of large-size cement kiln alumina-silicon nitride compound abrasive brick and manufacture method thereof.

Background technology:

Along with the continual renovation of technology of producing cement, manufacture of cement major equipment rotary kiln to the longevityization development of maximizing, especially increases output, improves the quality, and energy efficient has become the key that increases benefit in the production management.At positions such as the transitional zone of large-scale cement rotary kiln, cooling zones, traditional refractory materials can't satisfy its requirement, mostly adopts spinel brick in the large-size cement kiln at present, its cost height, and the heat conduction height, wear-resisting poor, work-ing life is low, cost performance low (about 6 months).

Summary of the invention:

The present invention seeks to solve the spinel brick that adopts in the present large-size cement kiln, cost height, heat conduction height, wear-resisting poor, the problem that work-ing life is low, cost performance is low

The invention provides the manufacture method of a kind of large-size cement kiln of high performance-price ratio with alumina-silicon nitride compound abrasive brick, is the refractory brick that adding industrial dextrin (or xylogen), hydraulic pressure system sintering form in high grade bauxite, silicon nitride, silicon carbide, bonding clay.The weight proportion that it is characterized in that each component is:

High grade bauxite≤5mm Al ₂O ₃〉=85% 65-80%

Silicon carbide≤1.5mm SiC 〉=90% 5-15%

Silicon nitride≤0.088mm Si ₃N ₄〉=98% 1-15%

Bonding clay≤0.088mm Al ₂O ₃〉=36% 4-8%

Industry dextrin or xylogen 0.2-0.7%

Water 2-5%

With above-mentioned raw materials on request proportioning mix, in mixing roll, make pug, at the forming under the pressure of 〉=400T, adobe is burnt till in 1300-1450 ℃ in tunnel furnace or shuttle kiln after the moulding.

Preparation process is as follows:

1., batching :≤5mm high grade bauxite (Al ₂O ₃〉=85%) 65-80% ,≤1.5mm silicon carbide (SiC 〉=90%) 5-15% ,≤0.088mm silicon nitride (Si ₃N ₄〉=98%) 1-15% ,≤0.088mm bonding clay 4%-8%, industrial dextrin 0.2-0.7% or xylogen 0.2-0.7%;

2., mixing: mixing order is: poured high grade bauxite and silicon carbide into mixer dried mixed 3～5 minutes earlier, then pour water into, batch mixing is 2～3 minutes again, pours blend fine powder (silicon nitride, clay, industrial dextrin or xylogen) into mixing again 10～15 minutes at last;

3., moulding: wet feed ageing mixture 1～2 compression moulding as a child that mixes, moulding press tonnage 〉=400T;

4., drying: more than 16 hours, dry kiln is gone into car mouth temperature less than 70 ℃ in the dry kiln drying, and dry top temperature temperature is controlled at 110～150 ℃;

5., burn till: burn till on hyperthermia tunnel Kiln or shuttle kiln, 1300～1450 ℃ of firing temperatures at high temperature are incubated 4～6 hours, and total firing time was at 60～100 hours.

Alumina-silicon nitride compound abrasive brick is used for the large-scale cement rotary kiln transitional zone.

This product is applicable to all size cement kiln usefulness, and the heat-insulating and energy-saving effect is very obvious, and has high-wearing feature, and long operational time can reach more than 1.5 years, and the operation factor that improves large-scale cement rotary kiln has been played very positive effect.The alumina that is fired into-silicon nitride compound abrasive brick, the simple cost of technology is low.

Embodiment:

Embodiment 1:

Large-size cement kiln alumina-silicon nitride compound abrasive brick, the weight proportion of each component is:

High grade bauxite≤5mm Al ₂O ₃〉=85% 71.8%

Silicon carbide≤1.5mm SiC 〉=90% 15%

Silicon nitride≤0.088mm Si ₃N ₄〉=98% 5%

Bonding clay≤0.088mm Al ₂O ₃〉=36% 5%

Wedding agent:

Industry dextrin 0.7%

Water 2.5%

Require proportioning to mix above-mentioned raw materials peace, make pug in mixing roll, at the forming under the pressure of 〉=400T, adobe is burnt till in 1300-1450 ℃ in tunnel furnace or shuttle kiln after the moulding.

Embodiment 2:

High grade bauxite≤5mm Al ₂O ₃〉=85% 71.8%

Silicon carbide≤1.5mm SiC 〉=90% 10%

Silicon nitride≤0.088mm Si ₃N ₄〉=98% 10%

Bonding clay≤0.088mm Al ₂O ₃〉=36% 5%

Wedding agent:

Industry dextrin 0.7%

Water 2.5%

Embodiment 3:

High grade bauxite≤5mm Al ₂O ₃〉=85% 71.8%

Silicon carbide≤1.5mm SiC 〉=90% 5%

Silicon nitride≤0.088mm Si ₃N ₄〉=98% 15%

Bonding clay≤0.088mm Al ₂O ₃〉=36% 5%

Wedding agent:

Xylogen 0.7%

Water 2.5%

Claims

1. a large-size cement kiln is characterized in that with alumina-silicon nitride compound abrasive brick with high grade bauxite grog and silicon carbide, silicon nitride be main raw material, and raw materials quality per-cent is :≤5mm Al ₂O ₃〉=85% high grade bauxite 65-80% ,≤the silicon carbide 5-15% of 1.5mm SiC 〉=90% ,≤0.088mm Si ₃N ₄〉=98% silicon nitride 1-15% ,≤0.088mm bonding clay 4-8%, mixed raw material adds 0.2-0.7% industry dextrin or xylogen and 2-5% water mixes, compacting, drying, makes alumina-silicon nitride compound abrasive brick at 1300-1450 ℃ after burning till.

2. a kind of large-size cement kiln as claimed in claim 1 manufacture method of alumina-silicon nitride compound abrasive brick is characterized in that preparation process is as follows:

1., batching :≤5mm high grade bauxite 65-80% ,≤1.5mm silicon carbide 5-15% ,≤0.088mm silicon nitride 1-15% ,≤0.088mm bonding clay 4%-8%, industrial dextrin 0.2-0.7% or xylogen 0.2-0.7%;

3. a kind of large-size cement kiln as claimed in claim 1 is characterized in that with alumina-silicon nitride compound abrasive brick alumina-silicon nitride compound abrasive brick is used for the large-scale cement rotary kiln transitional zone.